Portable computer



FIG. 1 is a top, front, right side perspective view of a portable computer showing our new design;

FIG. 2 is a bottom, rear, right side perspective view thereof;

FIG. 3 is a left side elevational view thereof; and,

FIG. 4 is a view similar to FIG. 1 but showing the same in an open position. 

The ornamental design for a portable computer, as shown and described. 